Rotary tool.



C. H. FRANKLIN.

ROTARY TOOL.

APPLICATION FILED Nov. 24. |915.

1 ,270,808. Patented July 2, 1918.

f 4 J0 EQ2 A His flttorneg.

UNITED STATES. PATENT OFFICE.-

CHARLES lH. FRANKLIN, F SGHENECTADY, NEW YORK.

ROTARY Toor..

To all whom it may concern:

Be it known'that I, CHARLES H. FRANK- LIN, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and luseful` Improvements in Rotary Tools, of

In the accompanying drawing, Figure 1l is a longitudinal sectional view of a tool embodying my invention; Fig. 2 is. a section taken on line 2-f2, Fig. 1, looking in the direction ofthe arrows' Fig. 3 is a sec'tionl taken on line 3-3, Fig. 1, looking toward the right, and Fig. 4 isa detail of a locking device.

` 4Referring to the drawing, v5 indicates an annular wall having a flange 6 on its rear edge. Formed integral with the -front edge y with theannular wall v is a rear wall 11 ovided with a central projectingI-'leevem' llslreaded on. its innersurface. A e three walls 5, 7 and'll: form a-housing or casin for a turbine wheel 13 supported on one en of a shaft 14 carried inthe bearings 9 and 1 0. On the outer end of the shaft 14 is a" tool 15 held in place by a screw 16. In the present` instance a small grinding tool is shown, but it will be` understood that any desired rotary tool mayfbe used, as, for example, a cutting tool 'ori a polishingl tool. Theturbine wheel 13is overhang on t e end of the shaft 14 and has a flange 17 through which are formed a 'series of tangential openings 18, three such openings beingl osent instance. The rear side a disk 17a which \engages a seat 17b on t e flange 17. The

4Wheel 1,3 rotat'4 shown in the of the wheel isfclosed b in the direction of the ar- Specication of'Letters Patent. l Patented J uly 2, 1918. Application led November 24, 1916. Serial No. 133,246.

row, Fig. .2, with the flange 17 in close proximity to the inner-surface of `the oasing wall 5. In .the wall 5 are a series of tangential openings 19 which are in the same vertical plane as the openings 18, but slope in the opposite direction, as shown in Fig. 2. The sides 20 of the openings 19 are stra'ight, while theI sides 21 are curved as'` shown. The openings 19 form the exhaust openings "for the escape of operatin fluid from the wheel 13. As will be clear, t e opera'ting fluid escaping from the tan ential openin 18 strikes against the curve walls 21 of t e openings 19 and is directed in a sm'oothl curved path outward. Threaded over the annular wall 5 with its edge engaging the shoulder 6 is an outercasin 22. This casing extends down in front o the wall 7, being slightly spaced therefrom, and engages an annularV shoulder 23 on the sleeve 8. l. Between the casing 22and wall 5 is an annular chamber 124 whichA forms anl Yexhaust chamber into which the operating fluid escapes from the openings 19. On the front and adjacent thesleeve 8, the casing 22 is provided with a series of exhaust openings 25 through which the operating'iluid escapes to atmosphere. In the space between' the casing 22 and the front wa1l,7 is arranged a series of interleaving projections 26 through which the operating fluid must pass on its way from the exhaust chamber 24 to the openings 25.. These form a muiiier or silencer for the tool and sup ress the noise of the escaping fluid. Carrie by the center of the wheel 13 is a thrust bushing 27. having one or more radial o enings 28 for the passage pf operating flui This bushing is supported in an opening in disk 17 and in a recess 17 in wheel 13. Surrounding the bushing 27 within the wheel is the annular chamber 27'. In the rear end of the bushin 27 .is a cone-shaped bearing surface 29 whic takes against the cone-shapedend 30 of a .tube 31 threaded into the sleeve 12 and held in placeby a lock nut'32.. The outer end of the' tube 31 is threaded to receive a hose vcoupling 33. The s1eeve.12and tube 31 form together another handle for the tool and inthis handle is arranged a valve for ios turning on and-olf the motive fluid; The

valve comprises a sleeve 34 on tube 31 hav? inghflanges 35 at its ends against which lits a s ell 36, thus providin an annular space 37 between them. The s eeve 34 and shell 36 are held between a collar 38 and a nut 39 v and are adapted to turnen the tube 31, the

by a linger.

turning movement being limited an arcuate 40 projecting from shell 36int0 slot 41 in-collar 38 (see Fig. 3). n 31 is a plug 42 and in tube 31 on opposite sides of the plug, and preferably diametri-v eally opposite each other, are holes 43 and 44. Thev sleeve 34 is provided with holes 45V and 46 adapted to be brought into and out of registry with holes 43 and 44 bv a turning movement of sleeve 34 and shell 36. In Fig. 1 thelioles are shown in registry. A locking device is provided for the turbine wheel so that it may beheld stationary when desired, as, for example, when the tool at thev v end of the vshaft is being changed. It comprises a spindle 47 which extends through the wall 11 andis adapted to engage a recess 48 in the flange 17. The spindle lsnormally pressed toward'the .wheel flange 17 by a spring49. 50 is a button on the end of the spindle 47, and 51 is a web projecting from The the spindle just beneath the button 50. web is adapted t0 slide in .notches 52 and 53 in al flange 54 which surrounds it. The notches 52, are deep so that when the web is in them the end of spindle 47 may engage .recess 48 (Fig. 1). The notches 53 are shallow and when lthe web rests. in them the spindle is out of engagement with the recess 48 (Fig. 4). As will be obvious, the web may passi be moved y from the one yposition to the other4 by pulling out onthe button and'turnin it. 55 indicates an oil hole through'which lu ricant may be introduced to bearings 9 and 10. In operation the tool is -connected to a source of fluid supply, as compressed-air, by

. a suitable flexible conduit. The motive fluid entering through the,- end of tube 31 passes through hqles 43 and 45.in to the annular space 37, thence through holes 46 and 44 to the tubel 31 on' the other side'of plug 42. From here it passes through the center opening of bushing 27, out through radial openings 28 to the-chamber 27", and from chamber 27-fit passes through tangential openings 18 in the flange 17 ,and tangential the exhaust chamber 24. From' the exhaust chamber it passes through the muler formedA by projections 26' andopenings 25 to atmosphere.

It` will be noted thatthe motive' Huid in through the openings 25 to atmosphere 1s directed" along the axis ofthe shaft 14 toward th'e working toolr15. By this means the exhaust fluid, which escapes with' lconsiderable velocity,'is utilized to blow the chips or particles being removed awa 'from the tool 15 andthe part being'worked upon so'as to keep the surface clean. The oper` ator can thus see exactly the work which the -tool 1s doing. The motive fluid acts on the turbine wheel by reactionl causmg it to rotate as 1s well understood. vThe motive-fluid may be quickly turned on and olf by turn- Inside tube hands,

one hand hold down close to the tool so that and comparatively `jecting from fthe-rear wall of' the casmg openings 43, 45, and 44, 46 into and out of registry.

Owing to the arrangement whereby there is a handle on each side of the turbine wheel casing, the tool is extremely .convenient to handle. The operator holds it with both one on each handle. This gives him it can-be carefully and accurately applied and moved over the work. The tool may also with advantage be clamped in a lathe, suitableclamps or holders being placed on either one or both sides ofthe turbine wheel casing.

The arrangement of the rotating parts whereby thev turbine wheel is overhung on one enol of the shaft andv the working tool is on the other endy is advantageous in that it provides for a long bearing for the shaft, while at the same time it enables the shaft to be comparatively short in over-al1 length and hence light. The long bearings, all on one side of the turbine casing, spaces the working tool quite some distance from the turbine casing so that the tool can heused very advantageously for reaching into the inside of a piece of work. The turbine wheel is practically balanced as to end pressure. Any end thrust in one direction is taken up by the cone-shaped end 30, and in the other direction by the endv of the bearingsleeve 10.

he structure as a whole is very small and light. In fact, it need weigh not more than two or three pounds. It is simple in design cheap to build. It can be very quickly and easi y repair or other purposes by turning olf the rear wall 11. The turbine wheel and shaft can then be pulled out longitudinally, the

disassembled for working tool 15 lhaving been first removed l of course.

In accordance with the provisions of the l p atent statutes, I have described the princ1 le of operation of my invention, together with the apparatus whichl I now consider to Arepresent the best embodimentthereof; but

I desire to have it understood that the ap-' paratusshownis only illustrative, and'that the invention can be carried out by` other means.

` What I claim as new and desire to secure v by Letters Patent of the United States, is,-v

1 .JIn an apparatus of the character described, the e combination of a. casing, i;

y sleeve projecting from the front wa the casmg, a shaft journaled in said sleeve,-

, a tool on theouter end of said shaft, a turbine -wheel1 in 'the cas'in carried by said shaft, said turbine whee' having a flange lwith openings therein fol' the Passage of motive fluid, said vcasingl'having openings wh1ch coperate therewit and a 'sleeve prothrough which motive fluid is led to the central portion of the turbine wheel from which Ait flows radiall outward, said two sleeves serving as han les for the apparatus.

2. In an apparatus of the character described, -the combination of a casing having a front wall and a detachable rear wall, a

` sleeve projecting from `the front wall, a

shaft journaled therein, a tool on the outer 1U end of `said shaft, a turbine wheel in the casingand overhung on the other end of the shaft, `a thrust bearing for the turbine Wheel carriedby the rear casing wall, and,

a sleeve projectin from the rear casing wall through whic motive fluid is Iled to the turbine wheel, said two projecting sleeves serving as handles for the apparatus.

3. In anapparatus ofthe character described, the combination ofv a casing having a front wall and a detachable rear wall, a sleeve projecting from the front wall, a

vshaft journaled therein, a tool on the outer end of, said shaft, a turbine wheel in the casin and overhung on the Jother end of the s aft, a thrust bearing for the turbine wheel carried by the rear casing wall, a

sleeve projecting from therear casing wall through whichv motivel iuid `is led to the turbine wheel, said two projecting sleeves 'serving as handlesr for the apparatus, and a ,valve in the sleeve 4which. projectsvfrom the rear casing'for controlling the motive fluid supply./

4. In an apparatus ofthe character/described, the combination of a casing, a sleeve progectingI therefrom and forming a handle, a s aft journaled in said sleeve, a turbine wheel in the casin and carried on one end I f of said shaft, a too on the other end thereof,

a' second sleeve projecting fromthe casing through which "motive fluid is conveyed to the turbine wheel,-and an outer casin surrounding a portion of the rst nam casingand forming an exhaust chamber, said outer casing having an exhaust open' which directs theexhaust toward 4the too.

5. In anfapparatus ofthe character -de scribed the combination of a casing, a sleeve projecting therefrom and forming a handle, a shaft journaled in said sleeve, a turbine wheel in the casi'n and carriedon one end of said shaft, a too on the other end thereof,

apsecond sleeve projecting from the casing through which motlve fluid is conveyed-'to the turbine wheel, and an outer casing surroundinga portion of the first named casing and forming an exhaust chamber, said outer casing having an exhaust opening, 4and means formin a muiiier interposed in the path of ioW 0I the exhaust fluid to said exhaust opening, f

6. In an apparatus of the character dei scribed, the combination of a casing, a sleeve projecting' therefrom, a shaft journaled in the sleeve, a tool on the outer end of the shaft, a turbine Wheel in the casin and carried by the shaft, said wheel'having -a flange with tangential openings therein for the passage of motive Huid, tan ntial open ings in the casing in the same p ane as those inthe flan an outer casing surrounding' 

